He is the only one of the students who a winner of scholarship for three years.
A. is
B. are
C. have been
D. has been
网友回答
A. is
B. are
C. have been
(答案→)D. has been
解析：考查定语从句。本定语从句的先行词是the only one是一个单数名词，所以后面使用单数形式，for three years通常与现在完成时连用，所以答案为D。句意：他是学生中唯一的一个三年都获得奖学金的学生。